sounds like the "bug" that is going around right now. my whole house has had it and almost all of our friends and their families have had.
don't need the doc right now. keep her hydrated (sp), with clear liquids. pedialyte is fine but it is no better then water just tastes better. and if you go that route you can save money with the store brand. also if she's up to eating, try white starches (rice, potatoes, saltine crackers, etc.) these are the easiest on the tummy to digest. no sugar drinks (pop, koolaid, gatorade) or milk and no green veggies, they are hard to digest
let her rest and keep her home tomorrow, hopefully she'll be feeling better as soon as tomorrow night.
motrin will help muscle aches as well as warm baths/showers.
good luck and also try to keep yourself healthy, it's an easy bug to get and it's no fun at all...i know i was there last week.